runtime: remove commented out code from ARM Linux boot
runtime: remove commented out code from ARM Linux boot

The code was commented out by https://golang.org/cl/13234050 in 2013.
Let's just remove it.

Change-Id: I46ae1f07386719e991458e782d236214c40bdce1
Reviewed-on: https://go-review.googlesource.com/70770
Run-TryBot: Ian Lance Taylor <87e9c6d529889242b7e184afb632328636553ab4@golang.org>
TryBot-Result: Gobot Gobot <66cb808b70d30c07676d5e946fee83fd561249e5@golang.org>
Reviewed-by: Austin Clements <7ea35d812706d9213868749011af1ed4fa2f6aa0@google.com>

cloudflare/go,akutz/go,cloudflare/go,Cofyc/go,CAFxX/go,josharian/go,CAFxX/go,akutz/go,cloudflare/go,nawawi/go,christopher-henderson/Go,golang/go,codestation/go,CAFxX/go,CAFxX/go,akutz/go,akutz/go,Cofyc/go,golang/go,cloudflare/go,nawawi/go,Cofyc/go,Cofyc/go,josharian/go,josharian/go,nawawi/go,nawawi/go,codestation/go,nawawi/go,codestation/go,codestation/go,Cofyc/go,Cofyc/go,cloudflare/go,golang/go,josharian/go,codestation/go,Cofyc/go,akutz/go,golang/go,CAFxX/go,codestation/go,CAFxX/go,cloudflare/go,CAFxX/go,akutz/go,cloudflare/go,nawawi/go,codestation/go,josharian/go,akutz/go,golang/go,josharian/go,josharian/go,golang/go,akutz/go,codestation/go,CAFxX/go,cloudflare/go,josharian/go,nawawi/go,Cofyc/go,golang/go,golang/go,nawawi/go